Curtana, also Cortana or Courtain, is a Latinized form of the Anglo-French curtein, from Latin curtus, 'shortened', used for a ceremonial type of sword.
Famous curtanas 
For the main article see Sword of Mercy
Curtana was also, according to legend, the sword of Ogier the Dane; it bore the inscription "My name is Cortana, of the same steel and temper as Joyeuse and Durendal." It is supposed to have originally been Tristan's sword, and gained the name "Cortana" when it was "cut down" to fit Ogier.
- Bullfinch's Mythology, Legends of Charlemagne, Chapter 24
- Gardner, Edmund Garratt. Arthurian Legend in English Literature. -- Temple Press, Letchworth, Hertfordshire. 1930. -- p. 172. Retrieved 6 December 2010.